Quantifying the Agyrotropy of Proton and Electron Heating in Turbulent Plasmas
Quantifying the Agyrotropy of Proton and Electron Heating in Turbulent Plasmas
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DOI：
10.3847/1538-4357/acb25a
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发表时间：
2023-02
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影响因子：
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通讯作者：
Yan Yang;F. Pecora;W. Matthaeus;Sohom Roy;M. Cuesta;A. Chasapis;T. Parashar;R. Bandyopadhyay;D. Gershman;B. Giles;J. Burch
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文献类型：
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作者：
Yan Yang;F. Pecora;W. Matthaeus;Sohom Roy;M. Cuesta;A. Chasapis;T. Parashar;R. Bandyopadhyay;D. Gershman;B. Giles;J. Burch
弱碰撞等离子体中能量耗散的一个重要方面是能量在不同物种(如质子和电子)之间和不同能量通道之间的分配。在这里，我们分析压力-应变相互作用来量化每个物种的各向同性压缩、旋转和非旋转加热的比例。将动力学湍流模拟的分析结果与磁鞘内磁层多尺度卫星资料的相应观测结果进行了对比分析。在评估质子和电子对压力-应变相互作用的不同成分的响应时，我们发现，对于电子和质子，磁鞘中的压缩加热比非压缩加热更强，而在动能等离子体湍流模拟中，非压缩加热更强。对于非压缩加热，无论是在模拟还是观测中，电子的回转贡献都大于非各向异性的贡献，而质子的非各向异性加热是增强的。文中还讨论了质子随等离子体β的变化，发现质子随着β的增大而获得更多的热。
An important aspect of energy dissipation in weakly collisional plasmas is that of energy partitioning between different species (e.g., protons and electrons) and between different energy channels. Here we analyse pressure–strain interaction to quantify the fractions of isotropic compressive, gyrotropic, and nongyrotropic heating for each species. An analysis of kinetic turbulence simulations is compared and contrasted with corresponding observational results from Magnetospheric Multiscale Mission data in the magnetosheath. In assessing how protons and electrons respond to different ingredients of the pressure–strain interaction, we find that compressive heating is stronger than incompressive heating in the magnetosheath for both electrons and protons, while incompressive heating is stronger in kinetic plasma turbulence simulations. Concerning incompressive heating, the gyrotropic contribution for electrons is dominant over the nongyrotropic contribution, while for protons nongyrotropic heating is enhanced in both simulations and observations. Variations with plasma β are also discussed, and protons tend to gain more heating with increasing β.